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Related Concept Videos

Functional Classification of Joints01:09

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...
Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...
Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary or...
Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
Bones of the Upper Limb: Radius01:09

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...

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Related Experiment Video

Updated: Jun 23, 2026

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography
06:31

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography

Published on: October 6, 2023

Metacarpophalangeal joint dislocation.

Paul Dinh1, Adam Franklin, Brian Hutchinson

  • 1Department of Orthopaedic Surgery, Keck School of Medicine, LAC/USC Medical Center, Los Angeles, CA, USA.

The Journal of the American Academy of Orthopaedic Surgeons
|May 5, 2009
PubMed
Summary
This summary is machine-generated.

Traumatic metacarpophalangeal joint dislocations are uncommon injuries. Complex dislocations may require surgery due to soft tissue entrapment, posing risks to nerves and potentially causing long-term complications.

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Metacarpal Small Incision for Carpal Tunnel Syndrome
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Metacarpal Small Incision for Carpal Tunnel Syndrome

Published on: April 5, 2024

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Last Updated: Jun 23, 2026

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography
06:31

Erosion Identification in Metacarpophalangeal Joints in Rheumatoid Arthritis using High-Resolution Peripheral Quantitative Computed Tomography

Published on: October 6, 2023

Metacarpal Small Incision for Carpal Tunnel Syndrome
04:08

Metacarpal Small Incision for Carpal Tunnel Syndrome

Published on: April 5, 2024

Area of Science:

  • Orthopedics
  • Hand Surgery
  • Traumatology

Background:

  • Traumatic dislocation of the metacarpophalangeal (MCP) joint is an infrequent injury.
  • These dislocations can be simple and reducible or complex, necessitating surgical intervention.

Purpose of the Study:

  • To review the mechanisms, challenges, and potential complications associated with traumatic MCP joint dislocations.
  • To highlight surgical considerations and risks, particularly concerning the volar approach.

Main Methods:

  • Review of existing literature on traumatic MCP joint dislocations.
  • Analysis of anatomical structures contributing to irreducible dislocations.
  • Discussion of surgical approaches and associated risks.

Main Results:

  • Complex MCP dislocations are often irreducible due to entrapment of the volar plate and surrounding soft tissues (flexor tendons, lumbrical muscle, ligaments).
  • The volar surgical approach carries a specific risk to the radial digital nerve of the index finger.
  • Potential complications include joint stiffness, arthritis, osteonecrosis, and physeal injuries in skeletally immature patients.

Conclusions:

  • Irreducible MCP joint dislocations require careful surgical management to address soft tissue interposition.
  • Awareness of anatomical risks, such as radial digital nerve injury, is crucial during surgical repair.
  • Early recognition and appropriate treatment are essential to minimize long-term sequelae.